I and many others here follow a Low Carb/High Fat/ High Protein diet. I try to limit my carb intake to around 85-85 grams daily.
Meat all types, bacon, fish all types, eggs any way, butter, cheese I eat a lot. Veg that grows above ground, mushrooms, asparagus, sprouts, broccoli for example.
No rice, noodles, pizza, bread, cakes anything that contains flour, potatoes. Not easy initially but after a while it becomes second nature.
Fruit I only eat berries, strawberries, raspberries, blackberries (80gr around 4 gr/carb) very rarely blueberries usually with double or extra thick cream-wonderful.
Nuts, walnuts for example.
Chocolate high cocao content 85% and above and in moderation.
There are many recipes available for low carb breads etc such as flaxseed bread.
Drinks, water perhaps infused with fruit to make it more interesteing, black coffee and tea, Alpro Unsweeteded Almond milkd(0carbs),
Once you get used to it, it is rather enjoyable to be honest.
Net result, no medication now, HaA1c and BG level in non diabetic range.
Weight loss 17 kilos
Cholestrol 3
Feel much better, fitter healthier and view my T2 diabetes now as purely an inconvenience.
There are a number of god books and phone apps that are a wealth of information and the Food and Carbs thread on this forum I foud invaluable.
Downside? There is none other than I have had to buy a complete new wardrobe and have my belts altered as my waist went from 38 to 33" in 3 months.
I feel the advice you have been given albeit maybe well-intentioned is out of date.
Good luck